IronPort - advanced configuration guide

Using the spf-passed Filter Rule
5-34
Cisco IronPort AsyncOS 7.6 for Email Advanced Configuration Guide
Chapter 5 Email Authentication
The spf-passed rule shows the results of SPF verification as a Boolean value. The following example
shows an spf-passed rule used to quarantine emails that are not marked as spf-passed:
quarantine-spf-unauthorized-mail:
if (not spf-passed) {
}
quarantine("Policy");
Note Unlike the spf-status rule, the spf-passed rule reduces the SPF/SIDF verification values to a simple
Boolean. The following verification results are treated as not passed in the spf-passed rule: None,
Neutral, Softfail, TempError, PermError, and Fail. To perform actions on messages based on more
granular results, use the spf-status rule.
Testing the SPF/SIDF Results
Test the results of SPF/SIDF verification and use these results to determine how to treat SPF/SIDF
failures because different organizations implement SPF/SIDF in different ways. Use a combination of
content filters, message filters, and the Email Security Monitor - Content Filters report to test the results
of the SPF/SIDF verification.
Your degree of dependence on SPF/SIDF verification determines the level of granularity at which you
test SPF/SIDF results.
Basic Granularity Test of SPF/SIDF Results
To get a basic measure of the SPF/SIDF verification results for incoming mail, you can use content filters
and the Email Security Monitor - Content Filters page. This test provides a view of the number of
messages received for each type of SPF/SIDF verification result.
To perform a basic SPF/SIDF verification test:
Step 1 Enable SPF/SIDF verification for a mail flow policy on an incoming listener, and use a content filter to
configure an action to take. For information on enabling SPF/SIDF, see Enabling SPF and SIDF,
page 5-24.
Step 2 Create an spf-status content filter for each type of SPF/SIDF verification. Use a naming convention to
indicate the type of verification. For example, use “SPF-Passed” for messages that pass SPF/SIDF
verification, or “SPF-TempErr” for messages that weren’t passed due to a transient error during
verification. For information about creating an spf-status content filter, see spf-status Content Filter
Rule in the GUI, page 5-33.
Step 3 After you have processed a number of SPF/SIDF verified messages, click Monitor > Content Filters to
see how many messages triggered each of the SPF/SIDF verified content filters.
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